Appendix B. Customer Replaceable Units (Crus) - Lenovo ThinkPad X300 6477 Supplementary Manual

Appendix B. Customer Replaceable Units (CRUs)

Customer Replaceable Units (CRUs) are computer parts that can be upgraded
or replaced by the customer. There are two types of CRUs: internal and
external. External CRUs are easy to install, whereas internal CRUs require
some technical skills and in some cases might require tools such as a
screwdriver. However, both internal and external CRUs are safe for removal
by the customer.
Customers are responsible for replacing all external CRUs. Internal CRUs can
be removed and installed by customers or by a Lenovo service technician
during the warranty period.
Your computer contains the following types of external CRUs:
v External CRUs (pluggable): These CRUs unplug from the computer.
Examples of these types of CRUs include the AC adapter and power cord.
v External CRUs with latches: These CRUs include a latch to help you
remove and replace the part. Examples of these types of CRUs include the
notebook main battery and devices such as an optical drive, a hard-disk
drive, and an extended battery.
Your computer contains the following types of internal CRUs:
v Internal CRUs (located behind an access panel): These CRUs are isolated
parts within the computer that are concealed by an access panel that is
typically secured by either one or two screws. Once the access panel is
removed, only the specific CRU is visible. Examples of these types of CRUs
include memory modules and storage devices.
v Internal CRUs (located within the product): These CRUs are accessible
only by opening the computer's outer case. Examples of these CRUs
include PCI Express Mini Cards and the integrated keyboard.
Online Access Help provides instructions for replacing internal and external
CRUs. To start the Access Help program, click Start, move the pointer to All
Programs ; then to ThinkVantage. Click Access Help.
Additionally, the Service and Troubleshooting Guide (this guide) and Setup
Instructions provide instructions for several critical CRU's.
If you are unable to access these instructions or if you have difficulty
replacing a CRU, you can use either of the following additional resources:
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